[pianotech] Inverted soundboard

[Ron Nossaman]

On 12/7/2010 7:53 AM, Terry Farrell wrote:
> Reminds me of my first adventure into piano technology (before I got
> into the business). My brand new S&S 1098 with a full quarter-inch of
> reverse crown - stretch a string across the back of the panel parallel
> to ribs, let string touch panel in center and observe both ends a
> quarter inch off the panel. I wish I remember whether I had taken any
> string bearing measurements - however I seriously doubt it - would have
> been interesting though. Dog-gone hard to imagine exactly what might
> have caused such a condition.

A couple of accumulated years of comparing crown and bearing 
measurements turns up a surprising number of killer octaves with both 
reverse crown, and negative bearing.
Ron N